react-native/Libraries/Utilities/logError.js

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule logError
 * @flow
 */
'use strict';

/**
 * Small utility that can be used as an error handler. You cannot just pass
 * `console.error` as a failure callback - it's not properly bound.  If passes an
 * `Error` object, it will print the message and stack.
 */
var logError = function(...args: $ReadOnlyArray<mixed>) {
  if (args.length === 1 && args[0] instanceof Error) {
    var err = args[0];
    console.error('Error: "' + err.message + '".  Stack:\n' + err.stack);
  } else {
    console.error.apply(console, args);
  }
};

module.exports = logError;